Lenze 8400 BaseLine D User Manual download pdf (Page 101)

Lenze · 8400 BaseLine D · Reference manual · DMS 5.5 EN · 01/2014 · TD05 101

5 Motor control (MCTRL)

5.6 Parameterisable additional functions

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

5.6.5 Oscillation damping

Mechanical oscillations are undesirable effects in every process and they may have an adverse effect

on the single system components and/or the production output.

Mechanical oscillations in the form of speed oscillations are suppressed by the oscillation damping

function.

Oscillation damping is successfully used with

• unloaded motors (no-load oscillations)

• motors whose rated power deviates from the rated power of the controller.

• e.g. during operation at high switching frequency including the power derating involved.

• operation with higher-pole motors

• operation with special motors

• compensation of resonance in the drive

• At an output frequency of approx. 20 ... 40 Hz, some asynchronous motors can show reso-

nance which causes current and speed variations and thus destabilise the running operation.

 How to eliminate speed oscillations:

1. Approach the area where the speed oscillations occur.

2. Reduce the speed oscillations by changing C234

step by step.

3. These can be indicators for smooth running:

• Constant motor current characteristic

• Reduction of the mechanical oscillations in the bearing seat

Parameter Info Lenze setting

Value Unit

C234 Oscillation damping influence 5.00 %

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 259 260

No comments

Lenze 8400 BaseLine D User Manual Page 101